Dci triggered srs enhancements

ABSTRACT

The present disclosure relates to methods and devices for signaling enhancements. In one aspect, a User Equipment (UE) can receive a configuration to transmit one or more sounding reference signals (SRSs) based on a downlink control information (DCI). The UE can also receive an indication of a plurality of non-contiguous resource blocks (RBs) based on the DCI. The UE can transmit a first SRS on a first set of one or more RBs of the plurality of non-contiguous RBs. Additionally, the UE can transmit a second SRS on a second set of one or more RBs of the plurality of non-contiguous RBs. The first set of one or more RBs and the second set of one or more RBs may be separated by a distance of at least one RB.

CROSS REFERENCE TO RELATED APPLICATION(S)

This application claims the benefit of U.S. Provisional Application Ser.No. 62/719,603, entitled “DCI TRIGGERED SRS ENHANCEMENTS” and filed onAug. 17, 2018, which is expressly incorporated by reference herein inits entirety.

TECHNICAL FIELD

The present disclosure relates generally to communication systems, andmore particularly, to methods and apparatus related to soundingreference signals in wireless communication.

INTRODUCTION

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources. Examples of suchmultiple-access technologies include code division multiple access(CDMA) systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. An example telecommunication standardis 5G New Radio (NR). 5G NR is part of a continuous mobile broadbandevolution promulgated by Third Generation Partnership Project (3GPP) tomeet new requirements associated with latency, reliability, security,scalability (e.g., with Internet of Things (IoT)), and otherrequirements. 5G NR includes services associated with enhanced mobilebroadband (eMBB), massive machine type communications (mMTC), and ultrareliable low latency communications (URLLC). Some aspects of 5G NR maybe based on the 4G Long Term Evolution (LTE) standard. There exists aneed for further improvements in 5G NR technology. These improvementsmay also be applicable to other multi-access technologies and thetelecommunication standards that employ these technologies.

SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all contemplated aspects, and is intendedto neither identify key or critical elements of all aspects nordelineate the scope of any or all aspects. Its sole purpose is topresent some concepts of one or more aspects in a simplified form as aprelude to the more detailed description that is presented later.

In wireless communications, e.g., millimeter wave (mmW) wirelesscommunication, base stations and UEs can transmit and/or receive data.Such data can be allocated over one or more resources. In someinstances, the information and/or data can be stored in non-contiguousresources. Accordingly, it can be advantageous and efficient to usesignaling enhancement to ensure the accurate transmission and/orreception of data.

The present disclosure relates to methods and devices for signalingenhancements, and more specifically signaling enhancements triggered bydownlink control information (DCI). In some aspects, a UE can receive aconfiguration to transmit one or more sounding reference signals (SRSs)based on a DCI. The UE can also receive an indication of a plurality ofnon-contiguous resource blocks (RBs) for a data transmission based onthe DCI. The UE can transmit a first SRS on a first set of one or moreRBs of the plurality of non-contiguous RBs. Additionally, the UE cantransmit a second SRS on a second set of one or more RBs of theplurality of non-contiguous RBs. The first set of one or more RBs andthe second set of one or more RBs may be separated by a distance of atleast one RB.

In other aspects, the UE can determine one or more groups of contiguousphysical RBs (PRBs) including one or more RBs in the indication for thedata transmission. The UE can also determine a number of RBs for thefirst set of one or more RBs and the second set of one or more RBs basedon a corresponding number of RBs in the one or more groups of contiguousPRBs for the data transmission. The number of RBs for the first set ofone or more RBs and the second set of one or more RBs may be based on aninteger number. For a group of contiguous PRBs for the data transmissionthat is less than the integer number, a corresponding SRS may betransmitted using a corresponding set of RBs that is increased to theinteger number. Also, the integer number can be received in anindication or pre-configured in the UE.

In further aspects, the first SRS can be in a first symbol within afirst slot and the second SRS can be in a second symbol within the firstslot. The first symbol, the first slot, and the second symbol may bedetermined based in part on one or more of the configuration and one ormore fields in the DCI. In other aspects, the first SRS can be in afirst symbol within a first slot and the second SRS can be in a secondsymbol within a second slot. Also, the first symbol, the first slot, thesecond symbol and the second slot may be determined based in part on oneor more of the configuration and one or more fields in the DCI.

The UE can also receive an indication of a hopping pattern associatedwith the first set of one or more RBs and the second set of one or moreRBs. The first SRS and the second SRS may be transmitted using thehopping pattern. In some aspects, the first set of RBs may be in a firstsymbol and the second set of RBs may be in a second symbol, and thefirst symbol and the second symbol may be determined based in part onone or more of the configuration and one or more fields in the DCI. Thefirst set of RBs and the second set of RBs may be mapped using thehopping pattern. Further, the hopping pattern is indicated based on theDCI. The hopping pattern can also be indicated as one of a range ofhopping patterns received using one or more the configuration, an radioresource control (RRC) signaling, or at least one field in the DCI. Infurther aspects, the DCI may indicate the hopping pattern, and thehopping pattern may indicate hopping within a group of contiguous PRBsallocated for the data transmission. Also, the hopping pattern mayinclude a first symbol within a first slot and a second symbol withinthe first slot, and the first symbol, the first slot, and the secondsymbol may be determined based in part on one or more of theconfiguration and one or more fields in the DCI. Additionally, thehopping pattern may include a first symbol within a first slot and asecond symbol within a second slot, and the first symbol, the firstslot, the second symbol and second slot may be determined based in parton one or more of the configuration and one or more fields in the DCI.

In an aspect of the disclosure, a method, a computer-readable medium,and an apparatus are provided for wireless communication at a UE. Theapparatus can receive a configuration to transmit one or more SRSs basedon a DCI. The apparatus can also receive an indication of a plurality ofnon-contiguous RBs based on the DCI. The apparatus can transmit a firstSRS on a first set of one or more RBs of the plurality of non-contiguousRBs. Further, the apparatus can transmit a second SRS on a second set ofone or more RBs of the plurality of non-contiguous RBs. The first set ofone or more RBs and the second set of one or more RBs may be separatedby a distance of at least one RB.

In a further aspect of the disclosure, a method, a computer-readablemedium, and an apparatus are provided for wireless communication at aUE. The apparatus can receive an indication of a plurality of RBs. Theapparatus can also receive a SRS configuration corresponding to theindication of the plurality of RBs, can the SRS configuration cancomprise at least one SRS condition to be applied during a temporary SRSwindow. Also, the apparatus can transmit at least one SRS on a set ofone or more RBs of the plurality of RBs according to the SRSconfiguration and the at least one SRS condition during the temporarySRS window.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network.

FIGS. 2A, 2B, 2C, and 2D are diagrams illustrating examples of a first5G/NR frame, DL channels within a 5G/NR subframe, a second 5G/NR frame,and UL channels within a 5G/NR subframe, respectively.

FIG. 3 is a diagram illustrating an example of a base station and userequipment (UE) in an access network.

FIG. 4 is a diagram illustrating a base station in communication with aUE.

FIGS. 5A and 5B display an example of wireless communication accordingto the present disclosure.

FIGS. 6A and 6B display an example of signaling according to the presentdisclosure.

FIG. 7 displays an example of signaling according to the presentdisclosure.

FIG. 8 is a diagram illustrating transmissions between a base stationand a UE.

FIG. 9 is a flowchart of a method of wireless communication.

FIG. 10 is a conceptual data flow diagram illustrating the data flowbetween different means/components in an example apparatus.

FIG. 11 is a diagram illustrating an example of a hardwareimplementation for an apparatus employing a processing system.

FIG. 12 is a flowchart of a method of wireless communication.

FIG. 13 is a conceptual data flow diagram illustrating the data flowbetween different means/components in an example apparatus.

FIG. 14 is a diagram illustrating an example of a hardwareimplementation for an apparatus employing a processing system.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of various configurations and isnot intended to represent the only configurations in which the conceptsdescribed herein may be practiced. The detailed description includesspecific details for the purpose of providing a thorough understandingof various concepts. However, it will be apparent to those skilled inthe art that these concepts may be practiced without these specificdetails. In some instances, well known structures and components areshown in block diagram form in order to avoid obscuring such concepts.

Several aspects of telecommunication systems will now be presented withreference to various apparatus and methods. These apparatus and methodswill be described in the following detailed description and illustratedin the accompanying drawings by various blocks, components, circuits,processes, algorithms, etc. (collectively referred to as “elements”).These elements may be implemented using electronic hardware, computersoftware, or any combination thereof. Whether such elements areimplemented as hardware or software depends upon the particularapplication and design constraints imposed on the overall system.

By way of example, an element, or any portion of an element, or anycombination of elements may be implemented as a “processing system” thatincludes one or more processors. Examples of processors includemicroprocessors, microcontrollers, graphics processing units (GPUs),central processing units (CPUs), application processors, digital signalprocessors (DSPs), reduced instruction set computing (RISC) processors,systems on a chip (SoC), baseband processors, field programmable gatearrays (FPGAs), programmable logic devices (PLDs), state machines, gatedlogic, discrete hardware circuits, and other suitable hardwareconfigured to perform the various functionality described throughoutthis disclosure. One or more processors in the processing system mayexecute software. Software shall be construed broadly to meaninstructions, instruction sets, code, code segments, program code,programs, subprograms, software components, applications, softwareapplications, software packages, routines, subroutines, objects,executables, threads of execution, procedures, functions, etc., whetherreferred to as software, firmware, middleware, microcode, hardwaredescription language, or otherwise.

Accordingly, in one or more example embodiments, the functions describedmay be implemented in hardware, software, or any combination thereof. Ifimplemented in software, the functions may be stored on or encoded asone or more instructions or code on a computer-readable medium.Computer-readable media includes computer storage media. Storage mediamay be any available media that can be accessed by a computer. By way ofexample, and not limitation, such computer-readable media can comprise arandom-access memory (RAM), a read-only memory (ROM), an electricallyerasable programmable ROM (EEPROM), optical disk storage, magnetic diskstorage, other magnetic storage devices, combinations of theaforementioned types of computer-readable media, or any other mediumthat can be used to store computer executable code in the form ofinstructions or data structures that can be accessed by a computer.

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network 100. The wireless communications system(also referred to as a wireless wide area network (WWAN)) includes basestations 102, UEs 104, an Evolved Packet Core (EPC) 160, and anothercore network 190 (e.g., a 5G Core (5GC)). The base stations 102 mayinclude macrocells (high power cellular base station) and/or small cells(low power cellular base station). The macrocells include base stations.The small cells include femtocells, picocells, and microcells.

The base stations 102 configured for 4G LTE (collectively referred to asEvolved Universal Mobile Telecommunications System (UMTS) TerrestrialRadio Access Network (E-UTRAN)) may interface with the EPC 160 throughbackhaul links 132 (e.g., S1 interface). The base stations 102configured for 5G NR (collectively referred to as Next Generation RAN(NG-RAN)) may interface with core network 190 through backhaul links184. In addition to other functions, the base stations 102 may performone or more of the following functions: transfer of user data, radiochannel ciphering and deciphering, integrity protection, headercompression, mobility control functions (e.g., handover, dualconnectivity), inter-cell interference coordination, connection setupand release, load balancing, distribution for non-access stratum (NAS)messages, NAS node selection, synchronization, radio access network(RAN) sharing, multimedia broadcast multicast service (MBMS), subscriberand equipment trace, RAN information management (RIM), paging,positioning, and delivery of warning messages. The base stations 102 maycommunicate directly or indirectly (e.g., through the EPC 160 or corenetwork 190) with each other over backhaul links 134 (e.g., X2interface). The backhaul links 134 may be wired or wireless.

The base stations 102 may wirelessly communicate with the UEs 104. Eachof the base stations 102 may provide communication coverage for arespective geographic coverage area 110. There may be overlappinggeographic coverage areas 110. For example, the small cell 102′ may havea coverage area 110′ that overlaps the coverage area 110 of one or moremacro base stations 102. A network that includes both small cell andmacrocells may be known as a heterogeneous network. A heterogeneousnetwork may also include Home Evolved Node Bs (eNBs) (HeNBs), which mayprovide service to a restricted group known as a closed subscriber group(CSG). The communication links 120 between the base stations 102 and theUEs 104 may include uplink (UL) (also referred to as reverse link)transmissions from a UE 104 to a base station 102 and/or downlink (DL)(also referred to as forward link) transmissions from a base station 102to a UE 104. The communication links 120 may use multiple-input andmultiple-output (MIMO) antenna technology, including spatialmultiplexing, beamforming, and/or transmit diversity. The communicationlinks may be through one or more carriers. The base stations 102/UEs 104may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz)bandwidth per carrier allocated in a carrier aggregation of up to atotal of Yx MHz (x component carriers) used for transmission in eachdirection. The carriers may or may not be adjacent to each other.Allocation of carriers may be asymmetric with respect to DL and UL(e.g., more or fewer carriers may be allocated for DL than for UL). Thecomponent carriers may include a primary component carrier and one ormore secondary component carriers. A primary component carrier may bereferred to as a primary cell (PCell) and a secondary component carriermay be referred to as a secondary cell (SCell).

Certain UEs 104 may communicate with each other using device-to-device(D2D) communication link 158. The D2D communication link 158 may use theDL/UL WWAN spectrum. The D2D communication link 158 may use one or moresidelink channels, such as a physical sidelink broadcast channel(PSBCH), a physical sidelink discovery channel (PSDCH), a physicalsidelink shared channel (PSSCH), and a physical sidelink control channel(PSCCH). D2D communication may be through a variety of wireless D2Dcommunications systems, such as for example, FlashLinQ, WiMedia,Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi accesspoint (AP) 150 in communication with Wi-Fi stations (STAs) 152 viacommunication links 154 in a 5 GHz unlicensed frequency spectrum. Whencommunicating in an unlicensed frequency spectrum, the STAs 152/AP 150may perform a clear channel assessment (CCA) prior to communicating inorder to determine whether the channel is available.

The small cell 102′ may operate in a licensed and/or an unlicensedfrequency spectrum. When operating in an unlicensed frequency spectrum,the small cell 102′ may employ NR and use the same 5 GHz unlicensedfrequency spectrum as used by the Wi-Fi AP 150. The small cell 102′,employing NR in an unlicensed frequency spectrum, may boost coverage toand/or increase capacity of the access network.

A base station 102, whether a small cell 102′ or a large cell (e.g.,macro base station), may include an eNB, gNodeB (gNB), or another typeof base station. Some base stations, such as gNB 180 may operate in atraditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies,and/or near mmW frequencies in communication with the UE 104. When thegNB 180 operates in mmW or near mmW frequencies, the gNB 180 may bereferred to as an mmW base station. Extremely high frequency (EHF) ispart of the RF in the electromagnetic spectrum. EHF has a range of 30GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters.Radio waves in the band may be referred to as a millimeter wave. NearmmW may extend down to a frequency of 3 GHz with a wavelength of 100millimeters. The super high frequency (SHF) band extends between 3 GHzand 30 GHz, also referred to as centimeter wave. Communications usingthe mmW/near mmW radio frequency band (e.g., 3 GHz-300 GHz) hasextremely high path loss and a short range. The mmW base station 180 mayutilize beamforming 182 with the UE 104 to compensate for the extremelyhigh path loss and short range.

The base station 180 may transmit a beamformed signal to the UE 104 inone or more transmit directions 182′. The UE 104 may receive thebeamformed signal from the base station 180 in one or more receivedirections 182″. The UE 104 may also transmit a beamformed signal to thebase station 180 in one or more transmit directions. The base station180 may receive the beamformed signal from the UE 104 in one or morereceive directions. The base station 180/UE 104 may perform beamtraining to determine the best receive and transmit directions for eachof the base station 180/UE 104. The transmit and receive directions forthe base station 180 may or may not be the same. The transmit andreceive directions for the UE 104 may or may not be the same.

The EPC 160 may include a Mobility Management Entity (MME) 162, otherMMES 164, a Serving Gateway 166, a Multimedia Broadcast MulticastService (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC)170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be incommunication with a Home Subscriber Server (HSS) 174. The MME 162 isthe control node that processes the signaling between the UEs 104 andthe EPC 160. Generally, the MME 162 provides bearer and connectionmanagement. All user Internet protocol (IP) packets are transferredthrough the Serving Gateway 166, which itself is connected to the PDNGateway 172. The PDN Gateway 172 provides UE IP address allocation aswell as other functions. The PDN Gateway 172 and the BM-SC 170 areconnected to the IP Services 176. The IP Services 176 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a PS StreamingService, and/or other IP services. The BM-SC 170 may provide functionsfor MBMS user service provisioning and delivery. The BM-SC 170 may serveas an entry point for content provider MBMS transmission, may be used toauthorize and initiate MBMS Bearer Services within a public land mobilenetwork (PLMN), and may be used to schedule MBMS transmissions. The MBMSGateway 168 may be used to distribute MBMS traffic to the base stations102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN)area broadcasting a particular service, and may be responsible forsession management (start/stop) and for collecting eMBMS relatedcharging information.

The core network 190 may include a Access and Mobility ManagementFunction (AMF) 192, other AMFs 193, a Session Management Function (SMF)194, and a User Plane Function (UPF) 195. The AMF 192 may be incommunication with a Unified Data Management (UDM) 196. The AMF 192 isthe control node that processes the signaling between the UEs 104 andthe core network 190. Generally, the AMF 192 provides QoS flow andsession management. All user Internet protocol (IP) packets aretransferred through the UPF 195. The UPF 195 provides UE IP addressallocation as well as other functions. The UPF 195 is connected to theIP Services 197. The IP Services 197 may include the Internet, anintranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service,and/or other IP services.

The base station may also be referred to as a gNB, Node B, evolved NodeB (eNB), an access point, a base transceiver station, a radio basestation, a radio transceiver, a transceiver function, a basic serviceset (BSS), an extended service set (ESS), a transmit reception point(TRP), or some other suitable terminology. The base station 102 providesan access point to the EPC 160 or core network 190 for a UE 104.Examples of UEs 104 include a cellular phone, a smart phone, a sessioninitiation protocol (SIP) phone, a laptop, a personal digital assistant(PDA), a satellite radio, a global positioning system, a multimediadevice, a video device, a digital audio player (e.g., MP3 player), acamera, a game console, a tablet, a smart device, a wearable device, avehicle, an electric meter, a gas pump, a large or small kitchenappliance, a healthcare device, an implant, a sensor/actuator, adisplay, or any other similar functioning device. Some of the UEs 104may be referred to as IoT devices (e.g., parking meter, gas pump,toaster, vehicles, heart monitor, etc.). The UE 104 may also be referredto as a station, a mobile station, a subscriber station, a mobile unit,a subscriber unit, a wireless unit, a remote unit, a mobile device, awireless device, a wireless communications device, a remote device, amobile subscriber station, an access terminal, a mobile terminal, awireless terminal, a remote terminal, a handset, a user agent, a mobileclient, a client, or some other suitable terminology.

Referring again to FIG. 1, in certain aspects, the UE 104 may include anreception component 198 configured to receive a configuration totransmit one or more sounding reference signals (SRSs) based on adownlink control information (DCI). The reception component 198 may alsobe configured to receive an indication of a plurality of non-contiguousresource blocks (RBs) based on the DCI. The reception component 198 mayalso be configured to transmit a first SRS on a first set of one or moreRBs of the plurality of non-contiguous RBs. The reception component 198may also be configured to transmit a second SRS on a second set of oneor more RBs of the plurality of non-contiguous RBs. In some aspects, thefirst set of one or more RBs and the second set of one or more RBs maybe separated by a distance of at least one RB.

Additionally, UE 104 may include a transmission component 199 configuredto receive an indication of a plurality of resource blocks (RBs). Thetransmission component 199 may also be configured to receive a soundingreference signal (SRS) configuration corresponding to the indication ofthe plurality of RBs, wherein the SRS configuration comprises at leastone SRS condition to be applied during a temporary SRS window. Thetransmission component 199 may also be configured to transmit at leastone SRS on a set of one or more RBs of the plurality of RBs according tothe SRS configuration and the at least one SRS condition during thetemporary SRS window.

FIG. 2A is a diagram 200 illustrating an example of a first subframewithin a 5G/NR frame structure. FIG. 2B is a diagram 230 illustrating anexample of DL channels within a 5G/NR subframe. FIG. 2C is a diagram 250illustrating an example of a second subframe within a 5G/NR framestructure. FIG. 2D is a diagram 280 illustrating an example of ULchannels within a 5G/NR subframe. The 5G/NR frame structure may be FDDin which for a particular set of subcarriers (carrier system bandwidth),subframes within the set of subcarriers are dedicated for either DL orUL, or may be TDD in which for a particular set of subcarriers (carriersystem bandwidth), subframes within the set of subcarriers are dedicatedfor both DL and UL. In the examples provided by FIGS. 2A, 2C, the 5G/NRframe structure is assumed to be TDD, with subframe 4 being configuredwith slot format 28 (with mostly DL), where D is DL, U is UL, and X isflexible for use between DL/UL, and subframe 3 being configured withslot format 34 (with mostly UL). While subframes 3, 4 are shown withslot formats 34, 28, respectively, any particular subframe may beconfigured with any of the various available slot formats 0-61. Slotformats 0, 1 are all DL, UL, respectively. Other slot formats 2-61include a mix of DL, UL, and flexible symbols. UEs are configured withthe slot format (dynamically through DL control information (DCI), orsemi-statically/statically through radio resource control (RRC)signaling) through a received slot format indicator (SFI). Note that thedescription infra applies also to a 5G/NR frame structure that is TDD.

Other wireless communication technologies may have a different framestructure and/or different channels. A frame (10 ms) may be divided into10 equally sized subframes (1 ms). Each subframe may include one or moretime slots. Subframes may also include mini-slots, which may include 7,4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on theslot configuration. For slot configuration 0, each slot may include 14symbols, and for slot configuration 1, each slot may include 7 symbols.The symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. Thesymbols on UL may be CP-OFDM symbols (for high throughput scenarios) ordiscrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (alsoreferred to as single carrier frequency-division multiple access(SC-FDMA) symbols) (for power limited scenarios; limited to a singlestream transmission). The number of slots within a subframe is based onthe slot configuration and the numerology. For slot configuration 0,different numerologies μ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots,respectively, per subframe. For slot configuration 1, differentnumerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, persubframe. Accordingly, for slot configuration 0 and numerology μ, thereare 14 symbols/slot and 2^(μ) slots/subframe. The subcarrier spacing andsymbol length/duration are a function of the numerology. The subcarrierspacing may be equal to 2^(μ)*15 kHz, where μ is the numerology 0 to 5.As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and thenumerology μ=5 has a subcarrier spacing of 480 kHz. The symbollength/duration is inversely related to the subcarrier spacing. FIGS.2A-2D provide an example of slot configuration 0 with 14 symbols perslot and numerology μ=0 with 1 slot per subframe. The subcarrier spacingis 15 kHz and symbol duration is approximately 66.7 μs.

A resource grid may be used to represent the frame structure. Each timeslot includes a resource block (RB) (also referred to as physical RBs(PRBs)) that extends 12 consecutive subcarriers. The resource grid isdivided into multiple resource elements (REs). The number of bitscarried by each RE depends on the modulation scheme.

As illustrated in FIG. 2A, some of the REs carry reference (pilot)signals (RS) for the UE. The RS may include demodulation RS (DM-RS)(indicated as R_(x) for one particular configuration, where 100x is theport number, but other DM-RS configurations are possible) and channelstate information reference signals (CSI-RS) for channel estimation atthe UE. The RS may also include beam measurement RS (BRS), beamrefinement RS (BRRS), and phase tracking RS (PT-RS).

FIG. 2B illustrates an example of various DL channels within a subframeof a frame. The physical downlink control channel (PDCCH) carries DCIwithin one or more control channel elements (CCEs), each CCE includingnine RE groups (REGs), each REG including four consecutive REs in anOFDM symbol. A primary synchronization signal (PSS) may be within symbol2 of particular subframes of a frame. The PSS is used by a UE 104 todetermine subframe/symbol timing and a physical layer identity. Asecondary synchronization signal (SSS) may be within symbol 4 ofparticular subframes of a frame. The SSS is used by a UE to determine aphysical layer cell identity group number and radio frame timing. Basedon the physical layer identity and the physical layer cell identitygroup number, the UE can determine a physical cell identifier (PCI).Based on the PCI, the UE can determine the locations of theaforementioned DM-RS. The physical broadcast channel (PBCH), whichcarries a master information block (MIB), may be logically grouped withthe PSS and SSS to form a synchronization signal (SS)/PBCH block. TheMIB provides a number of RBs in the system bandwidth and a system framenumber (SFN). The physical downlink shared channel (PDSCH) carries userdata, broadcast system information not transmitted through the PBCH suchas system information blocks (SIBs), and paging messages.

As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as Rfor one particular configuration, but other DM-RS configurations arepossible) for channel estimation at the base station. The UE maytransmit DM-RS for the physical uplink control channel (PUCCH) and DM-RSfor the physical uplink shared channel (PUSCH). The PUSCH DM-RS may betransmitted in the first one or two symbols of the PUSCH. The PUCCHDM-RS may be transmitted in different configurations depending onwhether short or long PUCCHs are transmitted and depending on theparticular PUCCH format used. Although not shown, the UE may transmitsounding reference signals (SRS). The SRS may be used by a base stationfor channel quality estimation to enable frequency-dependent schedulingon the UL.

FIG. 2D illustrates an example of various UL channels within a subframeof a frame. The PUCCH may be located as indicated in one configuration.The PUCCH carries uplink control information (UCI), such as schedulingrequests, a channel quality indicator (CQI), a precoding matrixindicator (PMI), a rank indicator (RI), and HARQ ACK/NACK feedback. ThePUSCH carries data, and may additionally be used to carry a bufferstatus report (BSR), a power headroom report (PHR), and/or UCI.

FIG. 3 is a block diagram of a base station 310 in communication with aUE 350 in an access network. In the DL, IP packets from the EPC 160 maybe provided to a controller/processor 375. The controller/processor 375implements layer 3 and layer 2 functionality. Layer 3 includes a radioresource control (RRC) layer, and layer 2 includes a packet dataconvergence protocol (PDCP) layer, a radio link control (RLC) layer, anda medium access control (MAC) layer. The controller/processor 375provides RRC layer functionality associated with broadcasting of systeminformation (e.g., MIB, SIBs), RRC connection control (e.g., RRCconnection paging, RRC connection establishment, RRC connectionmodification, and RRC connection release), inter radio access technology(RAT) mobility, and measurement configuration for UE measurementreporting; PDCP layer functionality associated with headercompression/decompression, security (ciphering, deciphering, integrityprotection, integrity verification), and handover support functions; RLClayer functionality associated with the transfer of upper layer packetdata units (PDUs), error correction through ARQ, concatenation,segmentation, and reassembly of RLC service data units (SDUs),re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; andMAC layer functionality associated with mapping between logical channelsand transport channels, multiplexing of MAC SDUs onto transport blocks(TBs), demultiplexing of MAC SDUs from TBs, scheduling informationreporting, error correction through HARQ, priority handling, and logicalchannel prioritization.

The transmit (TX) processor 316 and the receive (RX) processor 370implement layer 1 functionality associated with various signalprocessing functions. Layer 1, which includes a physical (PHY) layer,may include error detection on the transport channels, forward errorcorrection (FEC) coding/decoding of the transport channels,interleaving, rate matching, mapping onto physical channels,modulation/demodulation of physical channels, and MIMO antennaprocessing. The TX processor 316 handles mapping to signalconstellations based on various modulation schemes (e.g., binaryphase-shift keying (BPSK), quadrature phase-shift keying (QPSK),M-phase-shift keying (M-PSK), M-quadrature amplitude modulation(M-QAM)). The coded and modulated symbols may then be split intoparallel streams. Each stream may then be mapped to an OFDM subcarrier,multiplexed with a reference signal (e.g., pilot) in the time and/orfrequency domain, and then combined together using an Inverse FastFourier Transform (IFFT) to produce a physical channel carrying a timedomain OFDM symbol stream. The OFDM stream is spatially precoded toproduce multiple spatial streams. Channel estimates from a channelestimator 374 may be used to determine the coding and modulation scheme,as well as for spatial processing. The channel estimate may be derivedfrom a reference signal and/or channel condition feedback transmitted bythe UE 350. Each spatial stream may then be provided to a differentantenna 320 via a separate transmitter 318TX. Each transmitter 318TX maymodulate an RF carrier with a respective spatial stream fortransmission.

At the UE 350, each receiver 354RX receives a signal through itsrespective antenna 352. Each receiver 354RX recovers informationmodulated onto an RF carrier and provides the information to the receive(RX) processor 356. The TX processor 368 and the RX processor 356implement layer 1 functionality associated with various signalprocessing functions. The RX processor 356 may perform spatialprocessing on the information to recover any spatial streams destinedfor the UE 350. If multiple spatial streams are destined for the UE 350,they may be combined by the RX processor 356 into a single OFDM symbolstream. The RX processor 356 then converts the OFDM symbol stream fromthe time-domain to the frequency domain using a Fast Fourier Transform(FFT). The frequency domain signal comprises a separate OFDM symbolstream for each subcarrier of the OFDM signal. The symbols on eachsubcarrier, and the reference signal, are recovered and demodulated bydetermining the most likely signal constellation points transmitted bythe base station 310. These soft decisions may be based on channelestimates computed by the channel estimator 358. The soft decisions arethen decoded and deinterleaved to recover the data and control signalsthat were originally transmitted by the base station 310 on the physicalchannel. The data and control signals are then provided to thecontroller/processor 359, which implements layer 3 and layer 2functionality.

The controller/processor 359 can be associated with a memory 360 thatstores program codes and data. The memory 360 may be referred to as acomputer-readable medium. In the UL, the controller/processor 359provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, and control signalprocessing to recover IP packets from the EPC 160. Thecontroller/processor 359 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with the DLtransmission by the base station 310, the controller/processor 359provides RRC layer functionality associated with system information(e.g., MIB, SIBs) acquisition, RRC connections, and measurementreporting; PDCP layer functionality associated with headercompression/decompression, and security (ciphering, deciphering,integrity protection, integrity verification); RLC layer functionalityassociated with the transfer of upper layer PDUs, error correctionthrough ARQ, concatenation, segmentation, and reassembly of RLC SDUs,re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; andMAC layer functionality associated with mapping between logical channelsand transport channels, multiplexing of MAC SDUs onto TBs,demultiplexing of MAC SDUs from TBs, scheduling information reporting,error correction through HARQ, priority handling, and logical channelprioritization.

Channel estimates derived by a channel estimator 358 from a referencesignal or feedback transmitted by the base station 310 may be used bythe TX processor 368 to select the appropriate coding and modulationschemes, and to facilitate spatial processing. The spatial streamsgenerated by the TX processor 368 may be provided to different antenna352 via separate transmitters 354TX. Each transmitter 354TX may modulatean RF carrier with a respective spatial stream for transmission.

The UL transmission is processed at the base station 310 in a mannersimilar to that described in connection with the receiver function atthe UE 350. Each receiver 318RX receives a signal through its respectiveantenna 320. Each receiver 318RX recovers information modulated onto anRF carrier and provides the information to a RX processor 370.

The controller/processor 375 can be associated with a memory 376 thatstores program codes and data. The memory 376 may be referred to as acomputer-readable medium. In the UL, the controller/processor 375provides demultiplexing between transport and logical channels, packetreassembly, deciphering, header decompression, control signal processingto recover IP packets from the UE 350. IP packets from thecontroller/processor 375 may be provided to the EPC 160. Thecontroller/processor 375 is also responsible for error detection usingan ACK and/or NACK protocol to support HARQ operations.

At least one of the TX processor 368, the RX processor 356, and thecontroller/processor 359 may be configured to perform aspects inconnection with 198 of FIG. 1.

At least one of the TX processor 368, the RX processor 356, and thecontroller/processor 359 may be configured to perform aspects inconnection with 199 of FIG. 1.

FIG. 4 is a diagram 400 illustrating a base station 402 in communicationwith a UE 404. Referring to FIG. 4, the base station 402 may transmit abeamformed signal to the UE 404 in one or more of the directions 402 a,402 b, 402 c, 402 d, 402 e, 402 f, 402 g, 402 h. The UE 404 may receivethe beamformed signal from the base station 402 in one or more receivedirections 404 a, 404 b, 404 c, 404 d. The UE 404 may also transmit abeamformed signal to the base station 402 in one or more of thedirections 404 a-404 d. The base station 402 may receive the beamformedsignal from the UE 404 in one or more of the receive directions 402a-402 h. The base station 402/UE 404 may perform beam training todetermine the best receive and transmit directions for each of the basestation 402/UE 404. The transmit and receive directions for the basestation 402 may or may not be the same. The transmit and receivedirections for the UE 404 may or may not be the same.

In wireless communications, e.g., Millimeter Wave (mmW) wirelesscommunication, base stations and UEs can transmit and/or receive amultitude of data between each other. Such data can be allocated overone or more resources. In some instances, the information and/or datacan be stored in non-contiguous resources. Accordingly, it can beadvantageous and efficient to use signaling enhancement to ensure theaccurate transmission and/or reception of data. For instance, signalingor SRS enhancements can be triggered by DCI.

Some aspects of wireless communications according to the presentdisclosure can include wireless concepts such as spatial diversity. Forinstance, in some aspects, spatial diversity can involve communicationwith multiple transmission reception points (TRPs). In these aspects,spatial diversity can be helpful for ultra-reliable low latencycommunication (URLLC). For example, spatial diversity can be helpful forcommunication of less than 1 ms latency and 10⁻⁶ reliability, e.g., infactory automation (FA).

FIG. 5A displays an example of wireless communication 500 according tothe present disclosure. More specifically, FIG. 5A displays spatialdiversity across TRPs. Spatial diversity can be achieved usingCoordinated Multipoint (CoMP) techniques. Some examples of CoMPtechniques can include coherent joint transmission techniques, as wellas non-coherent joint transmission techniques

Aspects of the present disclosure can include uplink reference signals,i.e., signals sent by the UE to TRPs or base stations, for a number ofreasons. For instance, disclosure base station can use uplink referencesignals from a UE, e.g., sounding reference signals (SRSs), fordetermining precoding for data transmissions with the UE. For example,uplink reference signals such as SRSs can be used by the base station toestimate a downlink or uplink channel. These channel estimations canoccur when downlink and uplink channels are somewhat similar, e.g., inTDD, and adapt parameters of the downlink or uplink transmission, suchas precoding, accordingly. SRSs can also be used for CoMP techniques.For instance, aspects of the present disclosure can attempt tounderstand what the channel is based on a signal from the UE, such as a.SRS. Based on this, in some aspects, the base station or TRP can adaptits transmission.

FIG. 5B displays an example of wireless communication 510 according tothe present disclosure. More specifically, FIG. 5B displays an exampleof downlink CoMP precoding using SRS. The CoMP precoding using SRS cancomprise a number of steps. For instance, the UE can be configured by aTRP to send an SRS. The UE can then send the SRS in an uplinktransmission. Multiple TRPs can then measure the SRS sent by the UE, andthe network or TRPs can use the SRS measurements to adapt downlink CoMPtransmissions to the UE.

Some aspects of the present disclosure can indicate certain SRSconfigurations based on resources for data, whether PDSCH or PUSCH,being contiguous or non-contiguous. In some aspects, coherent CoMPtechniques may be useful to increase downlink capacity. For example, SRScan be used for downlink precoding determination, e.g., assuming thatTDD is being used. In other aspects, it may be more efficient toconfigure the UE to transmit an SRS on data channel RBs associated withthe UE. For instance, the TRP may be trying to adapt a precoder for itsdownlink transmission to the UE. For example, the TRP may not want theUE to transmit over certain RBs. In these instances, the TRP caninstruct the UE to transmit SRS in a manner that avoids the certain RBs.This may lead to non-contiguous RBs for the SRS.

In aspects of the present disclosure including industrial Internet ofThings (IIoT) or URLLC use cases, RF can be very dynamic and PDSCHallocations may need to be updated quickly, e.g., within one to five ms,in order to keep meeting latency or reliability requirements. Forinstance, if a PDSCH allocation update results in a change to PDSCH RBs,the SRS may have to be adapted quickly, so that the SRS can betransmitted on an updated set of PDSCH RBs. Also, the SRS may have to beadapted quickly so that the precoding can be updated. If the PDSCH RBsare not contiguous, then the SRS transmission may need to skip or hopfrequencies or RBs. RBs groups that are non-contiguous may be referredto as RB islands. In some aspects, the SRS may hop across RBs in acontiguous or non-contiguous set of RBs In some aspects, the SRS may notbe transmitted over non-contiguous RBs in one symbol.

Some aspects of the present disclosure can include a combined DCI toquickly adapt SRS configuration. For instance, to meet URLLC reliabilityand latency requirements, the network and UEs, should be able to quicklyadapt to changing channel conditions. To facilitate resource allocationchanges between a TRP and a plurality of UEs, a TRP may transmitdownlink control information (DCI) to each UE. However, sending separateDCI for each information type (e.g., uplink data, downlink data,sounding reference signal (SRS), and channel state information referencesignal (CSI-RS)) is inefficient and reduces adaptation speed, whichincreases latency. Accordingly, the joint DCI configuration techniquesdisclosed herein improve latency, for example, by indicating multipleinformation types using a single DCI.

In certain aspects, a TRP can be configured for joint DCI configurationby receiving a capability indication from a UE. The capabilityindication may indicate a capability of a UE to support joint DCIconfiguration. The capability indication may be sent from the UE (e.g.,in one or more of a radio resource control (RRC) message, a MediumAccess Control (MAC) Control Element (CE) message, and a Non-AccessStratum (NAS) message). When a UE and TRP are capable of joint DCIconfiguration, a TRP can determine to indicate allocation of resourcesfor communicating two or more information types to one or more (UEs) ina single DCI. It will be appreciated that joint DCI configuration atleast allows for a reduction in DCI transmissions (e.g., compared to aTRP using a DCI for every indication or allocation of resources forcommunicating each information type).

In certain aspects, a DCI includes an allocation of resources forcommunicating two or more information types to one or more userequipments (UEs) (e.g., for a plurality of UEs) in a single DCItransmitted by a TRP. In certain aspects, the DCI may includeinformation that explicitly indicates allocated resources forcommunicating all or at least one of the information types.

In certain aspects, the DCI does not explicitly indicate allocatedresources for communicating at least one of the information types. Insome such aspects, the allocation of resources for communicating two ormore information types to one or more user equipments is furtherindicated to the one or more UEs using association information. It willbe appreciated that the association information is transmitted to theone or more UEs in one or more of: a radio resource control (RRC)message, a MAC (Medium Access Control) Control Element (CE) message, aNon-Access Stratum (NAS) message an association information message, orthe DCI. In certain aspects, association information includes anindication that resources for one information type of the two or moreinformation types are allocated relative to resources for anotherinformation type of the two or more information types (e.g., theindication indicates that one or more of a downlink data, an uplinkdata, a CSI-RS and a SRS are allocated to same resource blocks).Accordingly, information in the DCI along with the associationinformation can be used to indicate allocated resources forcommunicating the at least one of the information types. For example,one of the DCI and association information may indicate explicitlyallocation of resources for communicating downlink data, and the otherof the DCI and association information may indicate that an indicationor allocation of resources for communicating uplink data is the same asan indication or allocation of resources for communicating downlinkdata. Accordingly, based on the DCI and association informationtogether, allocation of resources for communicating uplink data isindicated.

In certain aspects, the indication or allocation of resources forcommunicating two or more information types to one or more UEs isfurther indicated by a radio resource control (RRC) message includinginformation indicative of the allocation of resources for communicatingat least one of SRS and CSI-RS. For example, information indicative ofthe allocation of resources for communicating at least one of SRS andCSI-RS includes one or more of a resource element density, an index ofsymbols within a slot with a transmission, a number of transmissionsafter a first transmission, an offset of transmissions after the firsttransmission, a hopping configuration, a cyclic shift configuration, andperiodicity of transmissions after the first transmission.

In certain aspects, the downlink resources granted to a UE for receivingdownlink transmissions transmitted from a TRP may change or be differentfrom those indicated in an initial downlink scheduling configuration.For example, an inter-TRP mobility event may occur where a UE moves froma connection with one TRP to a connection with another TRP, channelconditions on a downlink or uplink may change (e.g., RF conditions maychange) (e.g., due to a change in location of a UE and/or TRP,electromagnetic interference, a new obstacle, etc.), and accordingly,the TRP may send a DCI using joint DCI configuration.

Thus, the RBs used to transmit SRS may correspond to the RBs allocatedfor a data channel, e.g., PDSCH or PUSCH. As the RBs allocated for thedata channel may be adapted, e.g., via DCI, the RBs for SRS transmissionmay similarly be adapted via a combined DCI. The RBs allocated for thedata channel may be non-contiguous, e.g., comprising PRB islandsallocated for the data channel. The RB groups may be referred to as anisland, because the RB groups may comprise subsets of contiguous RBsgroups that are separated from each other by at least one RB. In someaspects, a joint or combined DCI can configure SRS hopping acrossmultiple non-contiguous RB groups or PRB islands correspond to the PRBislands allocated for the data channel. SRSs can be important forcapacity and SRS may need to be transmitted quickly, e.g., in a dynamicchannel. In some aspects, the downlink SRS may be non-contiguous, inwhich case the present disclosure can support hopping across PRBs orfrequencies. As mentioned above, a PRB island can describe a set ofnon-contiguous RBs. Some aspects of the present disclosure may supporthopping across certain sizes of PRB islands, e.g., quantized datachannel PRB islands. In these aspects, a quantized PRB island may beformed by rounding-up or increasing each PRB island to a multiple of NPRBs, wherein N can be an integer (e.g., 1, 2, 4, etc.). In an examplein which the integer N is 4, any PRB islands for the data channel thatare less than 4 RBs will be increased to 4 RBs for transmission of thecorresponding SRS. If a PRB island for PDSCH comprises 3 PRBs, thecorresponding SRS may be transmitted on the 3 PRBs along with anadjacent PRB in order to span 4 contiguous PRBs. The UE may receive anindication, from a base station, of the integer number for quantizingthe groups of RBs for SRS. The SRS may be transmitted in a manner suchthat the UE hops from transmitting a first SRS on a first set ofcontiguous RBs and then hops to a different, non-contiguous frequency totransmit a second SRS on a second set of contiguous RBs. The RB hopping,or frequency hopping, for the SRS transmissions may be intra-slot, withthe hopping taking place across different symbols within a single slot.In another example, the RB hopping or frequency hopping for the SRS maybe inter-slot hopping, in which the hopping takes place across symbolsin different slots. In yet another example, the hopping may occur as acombination of intra-slot and inter-slot hopping. As mentioned above,the SRS hopping may take place over contiguous or non-contiguous set ofRBs. FIGS. 6A and 6B display examples of signaling according to thepresent disclosure. More specifically, FIGS. 6A and 6B display examplesof PRB island hopping patterns for SRS transmissions. FIG. 6Aillustrates a PRB island hopping pattern 600 wherein the RB range forSRS hops from PRBs 1-16 in a first time period to PRBs 33-48 in a secondtime period. The time period may correspond to different symbols withina single slot, or to different slots.

In other aspects, the present disclosure can support an indication of aPRB island hopping pattern that is indicated from the base station tothe UE. The UE may then apply the indicated pattern in transmitting theSRS. PRB islands may be the same size as one another or different sizesthan one another. If the PRB islands are different sizes for a datachannel, the UE may quantize the groups of PRBs for SRS transmission ina manner that causes the groups of PRBs to have the same size. In oneexample, a hopping pattern may indicate different PRB islands for SRStransmission in different symbols. Further, a UE may determine a symbolto PRB island mapping for SRS using a hopping pattern. Hopping patternsaccording to the present disclosure may inform the UE when and where tostart an SRS and when to hop SRSs. These PRB island hopping patternindications may be sent using a variety of techniques. For instance,hopping patterns may be indicated using RRC signaling, e.g., RRC messagemay be used to indicate a range of applicable patterns. The patternrange may list the order of PRB islands, e.g., if there are four PRBislands, examples of different patterns may include [1 2 3 4], [2 3 41], [3 4 1 2], or [4 1 2 3]. In the example [1 2 3 4], the UE willdetermine to transmit SRS of the first PRB island in a first symbol,followed by SRS transmitted on a second PRB island in a second symbol,followed by SRS transmitted on a third PRB island in a third symbol, andending with SRS transmitted on a fourth PRB island in a fourth symbol.In contrast, the pattern [4 1 2 3] indicates to the UE to transmit SRSon the fourth PRB island in a first symbol, transmit SRS on a first PRBisland in a second symbol, transmit SRS on a second PRB island in athird symbol, and transmit SRS on a third PRB island in a fourth symbol.Accordingly, the RRC signaling can inform the applicable hopping patternto apply in transmitting the SRS. Further, the hopping pattern may beindicated using a field in a combined DCI. For example, the field maypoint to a specific pattern. In some aspects, the combined DCI caninclude both downlink of the assignment and the SRS of the assignment,as well as where to fix the patterns for SRS hopping. Further, hoppingpatterns may be indicated using a radio network temporary identifier(RNTI), which can be used for the combined DCI or the symbol, slot, orframe number for the SRS transmission. In some aspects, an RNTI can helpto randomize inter and intra cell interference caused by the SRStransmissions. As such, the present disclosure can randomize the hoppingpattern. In other aspects, the RRC can indicate a range of applicablepatterns, and the DCI can inform which patterns.

FIG. 6A illustrates a PRB island hopping pattern 600 wherein the RBrange hops from 1-16 to 33-48. In one aspect, this PRB island hoppingpattern can be listed as [1 2], wherein ‘1’ is the first PRB island and‘2’ is the second PRB island. FIG. 6B illustrates a PRB island hoppingpattern 610 wherein the RB range hops from 33-48 to 1-16. This PRBisland hopping pattern can be listed as [2 1], wherein ‘2’ is the secondPRB island and ‘1’ is the first PRB island.

In other aspects of the present disclosure, the combined DCI may includea configuration for intra-PRB island hopping. Thus, the UE may hop fromPRBs 1-8 in a symbol to PRBs 9-16 in a second symbol, even though PRBs1-16 form a contiguous group of PRBs for SRS transmission. The intra-PRBisland hopping may be combined with inter-PRB island hopping, in whichthe UE also hops to transmit SRS on non-contiguous sets of PRBs, e.g.,PRB islands. The intra-PRB-island hopping may be intra-slot, i.e., thehopping takes place across different symbols in one slot, or inter-slot,i.e., the hopping takes place across symbols in different slots, or acombination of intra-slot and inter-slot. In some aspects, the UE candetermine to which pattern the RBs apply by mapping. As indicated above,the UE can map to the first PRB island by referencing ‘1’ and map to thesecond PRB island by referencing ‘2’.

In further aspects, the PRB islands allocated for a data channel canhave different sizes of islands and indicate these islands to the UE aspart of the hopping indication. Also, the PRB islands may be determinedbased on whether the data channel RBs are contiguous or non-contiguous,e.g., the PRB islands may be determined as contiguous groups of PRBsthat are separated from another group by at least one PRB. In oneaspect, the UE may quantize the PDSCH allocation in order to determineRBs for SRS transmission. In other aspects, RRC signaling can transmit ahopping pattern as well as number of PRBs for an SRS configuration. Asindicated above, the number of PRBs for SRS can be determined based onan integer N. Also, SRS hopping according to the present disclosure canbe performed across any number of RBs or frequencies. Moreover, the gapbetween different RB groups for SRS transmissions can include the sameor different number of RBs.

Other aspects may address the potential for SRS corresponding to anupdated data channel, to be insufficient for computing decoding for theupdated data channel. In some aspects, a TRP or base station may informa UE to sound an SRS. Then the TRP or base station may measure the SRS.Also, the TRP or base station may determine the precoding based on themeasured SRS and use it for data transmissions. In further aspects, whenallocated PDSCH RBs are updated, the SRS configuration can be updated tomatch the PDSCH RBs using the combined DCI. The adjustment to the SRSmay be applied in the next SRS occasion following receipt of the DCI. Asa group of SRS transmissions may be used together for the base stationto compute precoding for the data channel, the UE may switch to theadjusted SRS within the group of SRS transmission. This may lead to aninsufficient number of SRS transmissions for the base station to makeaccurate precoding determinations, e.g., to meet the processing gaintargets for the a data channel transmission.

FIG. 7 displays an example of signaling 700 according to the presentdisclosure. More specifically, FIG. 7 illustrates PDSCH transmissionsand SRS transmissions in different slots. FIG. 7 shows that uplinkcentric slots are even numbered, while downlink centric slots are oddnumbered. As shown in FIG. 7, a first set SRSs based on a first SRSconfiguration may be transmitted in slots 0.9, 1.1, and 1.3. Following aDCI with an update for the SRS and PDSCH, a second set of SRSs based ona second SRS configuration may be transmitted in slots 1.5, 1.7, 1.9,2.1, 2.3, 2.5, 2.7, and 2.9. Also, the a first set of PDSCHtransmissions may be transmitted in slots 1.0, 1.2, 1.4, 1.6, and 1.8based on a first PDSCH grant. An updated PDSCH grant may be indicated inthe DCI in slot 1.4. A second set of PDSCH transmissions may betransmitted in slots 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, and 3.2 based on asecond PDSCH grant indicated in the DCI. A TRP may use a number of SRSsto determine the precoding for the PDSCH. For example, a TRP may use aset of four SRS to determine the precoding for the PDSCH. As illustratedin FIG. 7, the TRP may use SRS in slot 2.1, 2.3, 2.5, and 2.7 todetermine precoding for PDSCH in slot 3.0. However, when the SRSconfiguration changes at slot 1.5, this may leave the TRP withinsufficient SRS information to make a precoding determination for thePDSCH in slot 2.0. For example, in slot 1.1 and 1.3, the SRS isaccording to the first SRS configuration. In slot 1.5 and 1.7, the SRSis according to a second SRS configuration. Thus, the TRP will not havea set of four SRS of the same SRS configuration to make a determinationfor PDSCH in slot 2.0. Further, in some aspects there may not besufficient time to update the SRS or to determine precoding. In otheraspects, a certain number, e.g., two, of SRS transmissions may be usedfor precoding. Also, the combined DCI may update the downlink RBs andSRS together.

In order to address this problem, the DCI can configure special SRScondition(s) that apply for a temporary SRS window. For instance, thepresent disclosure can include a special SRS condition configuration forSRS configured by a DCI that is applicable for a configurable period.The configurable period may be referred to as a special SRS conditionswindow. This special SRS conditions window may begin with the receptionof DCI and the ending can be determined based on an indicated length ofthe window, e.g., determined based on DCI or an RRC message. Thus, theUE may receive an indication of a window length in DCI or an RRC messageand may determine the window to last from receipt of the DCI until theindicated window length has passed. Also, the length of the SRSconditions window can be indicated to the UE in units, e.g., number ofslots, or in time. In one example, the TRP or base station can informthe UE to increase transmission power for the SRS during the SRSconditions window. For example, the TRP or base station can indicate theinitial conditions to the UE in order to adapt the initial SRStransmission to compensate for a lack of proper SRSs. The DCI may be acombined DCI format or another DCI format. The DCI may include an updateto a PUSCH grant or PDSCH grant along with the SRS configurationinformation. In another example, the DCI may be sent without an updatedPDSCH/PUSCH grant and may be used to trigger an SRS, to update an SRSconfiguration, or to apply the special SRS conditions during the specialSRS conditions window, etc. . . . For example, when the SRS istemporarily boosted because the measurement quality goes down, e.g., dueto any of interference, mobility, etc., these special SRS conditions canbe used.

In one example, the special SRS conditions configuration may include aperiodicity, e.g., to allow more frequent SRS during the initialconditions window. In another example, the special SRS conditionsconfiguration may include an indication of symbols, e.g., to allow formore symbols during initial conditions window. In another example, thespecial SRS conditions configuration may include an indication ofdensity and resource element (RE) offset, e.g., to allow for moresymbols during the initial conditions window. In another example, thespecial SRS conditions configuration may include an indication of an SRStransmit power delta or an SRS transmit power, e.g., to allow highertransmit power during initial conditions window. For the density and REoffset examples, the TRP or base station can instruct the UE to transmitmore frequently. As such, instead of transmitting every other slot, theUE can transmit more frequently. In further aspects, the duration ofspecial SRS conditions window may be configured using DCI or RRCsignaling, such as a previous RRC message. The special SRS conditionsconfiguration may include any combination of these example conditions.

FIG. 8 is a diagram 800 illustrating transmissions between base station804 and a UE 802. For instance, base station 804 can transmit 810 aconfiguration to transmit one or more SRSs 811 based on a DCI. Theconfiguration may contain one or more parameters associated with the SRSand may be sent using RRC signaling. UE 802 can receive 820 theconfiguration to transmit one or more SRSs based on the DCI. Basestation 804 can also transmit 830 an indication of a plurality ofnon-contiguous RBs 831 for a data transmission using the DCI. Likewise,UE 802 can also receive 840 the indication of a plurality ofnon-contiguous RBs for a data transmission based on the DCI. Theplurality of non-contiguous RBs can include one or more groups of RBs,wherein each group of the RBs can be non-contiguous with other groups ofRBs. Each individual RB within a group of RBs can be contiguous with theother individual RBs within the group of RBs. The UE may receive theindication via a DCI. Also, the data transmission can be PDSCH downlinkdata transmission or a PUSCH uplink data transmission. Base station 804can also transmit 842 an indication 843 of a hopping pattern associatedwith the first set of one or more RBs and the second set of one or moreRBs. Likewise, UE 802 can receive 844 the indication of a hoppingpattern associated with the first set of one or more RBs and the secondset of one or more RBs. UE 802 can then transmit 850 a first SRS 851 ona first set of one or more RBs of the plurality of non-contiguous RBs.Base station 804 can receive 860 the first SRS on the first set of oneor more RBs of the plurality of non-contiguous RBs. Additionally, the UEcan transmit 870 a second SRS 871 on a second set of one or more RBs ofthe plurality of non-contiguous RBs. Likewise, base station 804 canreceive 880 the second SRS on the second set of one or more RBs of theplurality of non-contiguous RBs. The first set of one or more RBs andthe second set of one or more RBs may be separated by a distance of atleast one RB, as described in connection with the examples in 6A and 6B.

In other aspects, UE 802 can determine one or more groups of contiguousPRBs including one or more RBs in the indication. UE 802 can alsodetermine a number of RBs for the first set of one or more RBs and thesecond set of one or more RBs based on a corresponding number of RBs inthe one or more groups of contiguous PRBs for the data transmission, asdescribed in connection with the examples in 6A and 6B. The number ofRBs for the first set of one or more RBs and the second set of one ormore RBs may be based on an integer number, e.g., may be increased to aquantized number of RBs based on an integer N. For a group of contiguousPRBs for the data transmission that is less than the integer number, acorresponding SRS may be transmitted using a corresponding set of RBsthat is increased to the integer number. Also, the integer number can bereceived in an indication or pre-configured in the UE.

In further aspects, the first SRS can be in a first symbol within afirst slot and the second SRS can be in a second symbol within the firstslot. The first symbol, the first slot, and the second symbol may bedetermined based in part on the configuration or one or more fields inthe DCI. In other aspects, the first SRS can be in a first symbol withina first slot and the second SRS can be in a second symbol within asecond slot. Also, the first symbol, the first slot, the second symboland the second slot may be determined based in part on the configurationor one or more fields in the DCI.

The first SRS and the second SRS may be transmitted using the hoppingpattern. In some aspects, the first set of RBs may be in a first symboland the second set of RBs may be in a second symbol, and the firstsymbol and the second symbol may be determined based in part on one ormore of the configuration and one or more fields in the DCI. The firstset of RBs and the second set of RBs may be mapped using the hoppingpattern. Further, the hopping pattern can be indicated based on the DCI.The hopping pattern can also be indicated as one of a range of hoppingpatterns received using one or more the configuration, RRC signaling orat least one field in the DCI. In further aspects, the DCI may indicatethe hopping pattern, and the hopping pattern may indicate hopping withina group of contiguous PRBs allocated for the data transmission. Also,the hopping pattern may include a first symbol within a first slot and asecond symbol within the first slot, and the first symbol, the firstslot, and the second symbol may be determined based in part on one ormore of the configuration and one or more fields in the DCI.Additionally, the hopping pattern may include a first symbol within afirst slot and a second symbol within a second slot, and the firstsymbol, the first slot, the second symbol and second slot may bedetermined based in part on one or more of the configuration and one ormore fields in the DCI.

In some aspects, the base station may transmit, and the UE may receive,an indication of a plurality of RBs, e.g., for a data transmission. Thebase station may also transmit, and the UE may receive, an SRSconfiguration corresponding to the indication of the plurality of RBsfor the data transmission. The SRS configuration can comprise at leastone SRS condition to be applied during a temporary SRS window. The UEcan also transmit, and the base station can receive, at least one SRS ona set of one or more RBs of the plurality of RBs according to the SRSconfiguration and the at least one SRS condition during the temporarySRS window. The UE can apply the at least one SRS condition during thetemporary SRS window and transmit the at least one SRS according to theSRS configuration without the at least one SRS condition after thetemporary SRS window. Also, at least a portion of the SRS configurationcan be included in a DCI. The indication of PRBs can also be included inthe DCI.

In other aspects, the base station can transmit, and the UE can receive,the DCI, wherein the temporary SRS window can begin when the DCI istransmitted. The DCI can be in a combined DCI format. The DCI may notindicate a new PUSCH grant or a PDSCH grant. Also, the DCI may includean update for a PUSCH grant or a PDSCH grant. The DCI may include orupdate a PUSCH grant or a PDSCH grant based on boosting a transmit powerof the at least one SRS. Additionally, the DCI may trigger thetransmission of the at least one SRS. The DCI may also update a priorSRS configuration. The at least one SRS condition may include at leastone of: a periodicity, a set of one or more symbols, an RE density, anRE offset, an SRS transmit power, or an SRS transmit power differential.Moreover, at least a portion of the SRS window may be configured usingDCI or an RRC message.

FIG. 9 is a flowchart 900 of a method of wireless communication. Themethod may be performed by a UE or a component of a UE (e.g., UE 104,350, 404, 802, apparatus 1002; processing system 1114, which may includethe memory 360 and which may be the entire UE or a component of the UE,such as the TX processor 368, the RX processor 356, and/or thecontroller/processor 359) communicating with a base station (e.g., basestation 102, 180, 310, 402, 804). Optional aspects are illustrated witha dashed line. The methods described herein can provide a number ofbenefits, such as improving communication signaling, resourceutilization, and/or power savings.

At 902, the UE can receive a configuration to transmit one or more SRSsbased on a DCI. For example, reception component 1004 of apparatus 1002may receive a configuration to transmit one or more SRSs based on a DCI.At 904, the UE can also receive an indication of a plurality ofnon-contiguous RBs based on the DCI. For example, reception component1004 of apparatus 1002 may receive a configuration to transmit one ormore SRSs based on a DCI. At 906, the UE can receive an indication of ahopping pattern associated with the first set of one or more RBs and thesecond set of one or more RBs. For example, reception component 1004 ofapparatus 1002 may receive an indication of a hopping pattern associatedwith the first set of one or more RBs and the second set of one or moreRBs.

At 908, the UE can determine one or more groups of contiguous PRBsincluding one or more RBs in the indication. For example, determinationcomponent 1006 of apparatus 1002 may determine one or more groups ofcontiguous PRBs including one or more RBs in the indication. At 910, theUE can also determine a number of RBs for the first set of one or moreRBs and the second set of one or more RBs based on a correspondingnumber of RBs in the one or more groups of contiguous PRBs, as describedin connection with the examples in 6A and 6B. For example, determinationcomponent 1006 of apparatus 1002 may determine a number of RBs for thefirst set of one or more RBs and the second set of one or more RBs basedon a corresponding number of RBs in the one or more groups of contiguousPRBs.

At 912, the UE can then transmit a first SRS on a first set of one ormore RBs of the plurality of non-contiguous RBs. For example,transmission component 1012 of apparatus 1002 may transmit a first SRSon a first set of one or more RBs of the plurality of non-contiguousRBs. At 914, the UE can transmit a second SRS on a second set of one ormore RBs of the plurality of non-contiguous RBs. For example,transmission component 1012 of apparatus 1002 may transmit a second SRSon a second set of one or more RBs of the plurality of non-contiguousRBs. The first set of one or more RBs and the second set of one or moreRBs may be separated by a distance of at least one RB, as described inconnection with the examples in FIGS. 6A and 6B.

The number of RBs for the first set of one or more RBs and the secondset of one or more RBs may be based on an integer number. For a group ofcontiguous PRBs for the data transmission that is less than the integernumber, a corresponding SRS may be transmitted using a corresponding setof RBs that is increased to the integer number. The integer number canbe received in an indication or pre-configured in the UE. In someaspects, the first SRS can be in a first symbol within a first slot andthe second SRS can be in a second symbol within the first slot or asecond slot. The first symbol, the first slot, and the second symbol maybe determined based in part on the configuration or one or more fieldsin the DCI.

The first SRS and the second SRS may be transmitted using the hoppingpattern. In some aspects, the first set of RBs may be in a first symboland the second set of RBs may be in a second symbol. The first set ofRBs and the second set of RBs may be mapped using the hopping pattern.Additionally, the hopping pattern can be indicated based on the DCI. Thehopping pattern can also be indicated as one of a range of hoppingpatterns received using one or more the configuration, RRC signaling orat least one field in the DCI. In some aspects, the DCI may indicate thehopping pattern, and the hopping pattern may indicate hopping within agroup of contiguous PRBs allocated for the data transmission. Also, thehopping pattern may include a first symbol within a first slot and asecond symbol within the first slot or a second slot. In some aspects,the indication of the plurality of non-contiguous RBs can be anallocation of the plurality of non-contiguous RBs for a datatransmission.

FIG. 10 is a conceptual data flow diagram 1000 illustrating the dataflow between different means/components in an example apparatus 1002.The apparatus may be a UE or a component of a UE. The apparatus includesa reception component 1004 that is configured to receive a configurationto transmit SRSs based on DCI, e.g., as described in connection withstep 902 above. Reception component 1004 is also configured to receivean indication of non-contiguous RBs for data, e.g., PDSCH or PUSCH,e.g., as described in connection with step 904 above. The apparatusincludes a determination component 1006 that is configured to determineone or more groups of contiguous PRBs, e.g., as described in connectionwith step 908 above. Determination component 1006 is also configured todetermine a number of RBs for the first set of RBs and the second set ofRBs, e.g., as described in connection with step 910 above. The apparatusalso includes an SRS component 1008 that is configured to transmit,e.g., via transmission component 1012, a first SRS on a first set ofRBs, e.g., as described in connection with step 912 above. SRS component1008 is also configured to transmit, e.g., via transmission component1012, a second SRS on a second set of RBs, e.g., as described inconnection with step 914 above. The apparatus also includes a hoppingcomponent 1010 that is configured to receive, e.g., via receptioncomponent 1004, an indication of a hopping pattern, e.g., as describedin connection with step 906 above.

The apparatus may include additional components that perform each of theblocks of the algorithm in the aforementioned flowcharts of FIGS. 8 and9. As such, each block in the aforementioned flowcharts of FIGS. 8 and 9may be performed by a component and the apparatus may include one ormore of those components. The components may be one or more hardwarecomponents specifically configured to carry out the statedprocesses/algorithm, implemented by a processor configured to performthe stated processes/algorithm, stored within a computer-readable mediumfor implementation by a processor, or some combination thereof.

FIG. 11 is a diagram 1100 illustrating an example of a hardwareimplementation for an apparatus 1002′ employing a processing system1114. The processing system 1114 may be implemented with a busarchitecture, represented generally by the bus 1124. The bus 1124 mayinclude any number of interconnecting buses and bridges depending on thespecific application of the processing system 1114 and the overalldesign constraints. The bus 1124 links together various circuitsincluding one or more processors and/or hardware components, representedby the processor 1104, the components 1004, 1006, 1008, 1010, 1012, andthe computer-readable medium/memory 1106. The bus 1124 may also linkvarious other circuits such as timing sources, peripherals, voltageregulators, and power management circuits, which are well known in theart, and therefore, will not be described any further.

The processing system 1114 may be coupled to a transceiver 1110. Thetransceiver 1110 is coupled to one or more antennas 1120. Thetransceiver 1110 provides a means for communicating with various otherapparatus over a transmission medium. The transceiver 1110 receives asignal from the one or more antennas 1120, extracts information from thereceived signal, and provides the extracted information to theprocessing system 1114, specifically the reception component 1004. Inaddition, the transceiver 1110 receives information from the processingsystem 1114, specifically the transmission component 1012, and based onthe received information, generates a signal to be applied to the one ormore antennas 1120. The processing system 1114 includes a processor 1104coupled to a computer-readable medium/memory 1106. The processor 1104 isresponsible for general processing, including the execution of softwarestored on the computer-readable medium/memory 1106. The software, whenexecuted by the processor 1104, causes the processing system 1114 toperform the various functions described supra for any particularapparatus. The computer-readable medium/memory 1106 may also be used forstoring data that is manipulated by the processor 1104 when executingsoftware. The processing system 1114 further includes at least one ofthe components 1004, 1006, 1008, 1010, 1012. The components may besoftware components running in the processor 1104, resident/stored inthe computer readable medium/memory 1106, one or more hardwarecomponents coupled to the processor 1104, or some combination thereof.The processing system 1114 may be a component of the UE 350 and mayinclude the memory 360 and/or at least one of the TX processor 368, theRX processor 356, and the controller/processor 359.

In one configuration, the apparatus 1002/1002′ for wirelesscommunication includes means for receiving a configuration to transmitone or more SRSs based on a DCI. The apparatus can also include meansfor receiving an indication of a plurality of non-contiguous RBs for adata transmission based on the DCI. The apparatus can also include meansfor transmitting a first SRS on a first set of one or more RBs of theplurality of non-contiguous RBs. Additionally, the apparatus can includemeans for transmitting a second SRS on a second set of one or more RBsof the plurality of non-contiguous RBs. The apparatus can furtherinclude means for determining one or more groups of contiguous PRBsincluding one or more RBs in the indication for the data transmission.The apparatus can also include means for determining a number of RBs forthe first set of one or more RBs and the second set of one or more RBsbased on a corresponding number of RBs in the one or more groups ofcontiguous PRBs for the data transmission. Moreover, the apparatus caninclude means for receiving an indication of a hopping patternassociated with the first set of one or more RBs and the second set ofone or more RBs. The aforementioned means may be one or more of theaforementioned components of the apparatus 1002 and/or the processingsystem 1114 of the apparatus 1002′ configured to perform the functionsrecited by the aforementioned means. As described supra, the processingsystem 1114 may include the TX Processor 368, the RX Processor 356, andthe controller/processor 359. As such, in one configuration, theaforementioned means may be the TX Processor 368, the RX Processor 356,and the controller/processor 359 configured to perform the functionsrecited by the aforementioned means.

FIG. 12 is a flowchart 1200 of a method of wireless communication. Themethod may be performed by a UE or a component of a UE (e.g., UE 104,350, 404, 802, apparatus 1302; processing system 1414, which may includethe memory 360 and which may be the entire UE or a component of the UE,such as the TX processor 368, the RX processor 356, and/or thecontroller/processor 359) communicating with a base station (e.g., basestation 102, 180, 310, 402, 804). Optional aspects are illustrated witha dashed line. The methods described herein can provide a number ofbenefits, such as improving communication signaling, resourceutilization, and/or power savings.

At 1202, the UE can receive an indication of a plurality of RBs, e.g.,for a data transmission. For example, reception component 1304 ofapparatus 1302 may receive an indication of a plurality of RBs. At 1204,the UE may receive an SRS configuration corresponding to the indicationof the plurality of RBs, e.g., for the data transmission. For example,reception component 1304 of apparatus 1302 may receive an SRSconfiguration corresponding to the indication of the plurality of RBs.The SRS configuration can comprise at least one SRS condition to beapplied during a temporary SRS window, as described in connection withthe example in FIG. 7. At 1206, the UE can transmit at least one SRS ona set of one or more RBs of the plurality of RBs according to the SRSconfiguration and the at least one SRS condition during the temporarySRS window. For example, transmission component 1312 of apparatus 1302may transmit at least one SRS on a set of one or more RBs of theplurality of RBs according to the SRS configuration and the at least oneSRS condition during the temporary SRS window. The UE can apply the atleast one SRS condition during the temporary SRS window and transmit theat least one SRS according to the SRS configuration without the at leastone SRS condition after the temporary SRS window. Also, at least aportion of the SRS configuration can be included in a DCI. Theindication of PRBs can also be included in the DCI.

At 1208, the UE can receive the DCI, wherein the temporary SRS windowcan begin when the DCI is transmitted. For example, reception component1304 of apparatus 1302 may receive the DCI, wherein the temporary SRSwindow can begin when the DCI is transmitted. The DCI can be in acombined DCI format. The DCI may not indicate a new PUSCH grant or aPDSCH grant. Also, the DCI may include an update for a PUSCH grant or aPDSCH grant. The DCI may include or update a PUSCH grant or a PDSCHgrant based on boosting a transmit power of the at least one SRS.Additionally, the DCI may trigger the transmission of the at least oneSRS. The DCI may also update a prior SRS configuration. The at least oneSRS condition may include at least one of: a periodicity, a set of oneor more symbols, an RE density, an RE offset, an SRS transmit power, oran SRS transmit power differential. Moreover, at least a portion of theSRS window may be configured using DCI or an RRC message. In someaspects, the indication of the plurality of RBs can be an allocation ofthe plurality of RBs for a data transmission.

FIG. 13 is a conceptual data flow diagram 1300 illustrating the dataflow between different means/components in an example apparatus 1302.The apparatus may be a UE or a component of a UE. The apparatus includesa DCI component 1306 that is configured to receive, e.g., via receptioncomponent 1304, a DCI from a base station, e.g., as described inconnection with step 1208 above. The apparatus also includes an SRScomponent 1308 that is configured to receive, e.g., via receptioncomponent 1304, an SRS configuration corresponding to indication of theplurality of RBs, e.g., for a data transmission, e.g., as described inconnection with step 1204 above. SRS component 1308 is also configuredto transmit, e.g., via transmission component 1312, at least one SRS ona set of RBs, e.g., as described in connection with step 1206 above. Theapparatus also includes an indication component 1310 that is configuredto receive, e.g., via reception component 1304, an indication of aplurality of RBs for a data transmission, e.g., as described inconnection with step 1202 above.

The apparatus may include additional components that perform each of theblocks of the algorithm in the aforementioned flowcharts of FIGS. 8 and12. As such, each block in the aforementioned flowcharts of FIGS. 8 and12 may be performed by a component and the apparatus may include one ormore of those components. The components may be one or more hardwarecomponents specifically configured to carry out the statedprocesses/algorithm, implemented by a processor configured to performthe stated processes/algorithm, stored within a computer-readable mediumfor implementation by a processor, or some combination thereof.

FIG. 14 is a diagram 1400 illustrating an example of a hardwareimplementation for an apparatus 1302′ employing a processing system1414. The processing system 1414 may be implemented with a busarchitecture, represented generally by the bus 1424. The bus 1424 mayinclude any number of interconnecting buses and bridges depending on thespecific application of the processing system 1414 and the overalldesign constraints. The bus 1424 links together various circuitsincluding one or more processors and/or hardware components, representedby the processor 1404, the components 1304, 1306, 1308, 1310, 1312, andthe computer-readable medium/memory 1406. The bus 1424 may also linkvarious other circuits such as timing sources, peripherals, voltageregulators, and power management circuits, which are well known in theart, and therefore, will not be described any further.

The processing system 1414 may be coupled to a transceiver 1410. Thetransceiver 1410 is coupled to one or more antennas 1420. Thetransceiver 1410 provides a means for communicating with various otherapparatus over a transmission medium. The transceiver 1410 receives asignal from the one or more antennas 1420, extracts information from thereceived signal, and provides the extracted information to theprocessing system 1414, specifically the reception component 1304. Inaddition, the transceiver 1410 receives information from the processingsystem 1414, specifically the transmission component 1312, and based onthe received information, generates a signal to be applied to the one ormore antennas 1420. The processing system 1414 includes a processor 1404coupled to a computer-readable medium/memory 1406. The processor 1404 isresponsible for general processing, including the execution of softwarestored on the computer-readable medium/memory 1406. The software, whenexecuted by the processor 1404, causes the processing system 1414 toperform the various functions described supra for any particularapparatus. The computer-readable medium/memory 1406 may also be used forstoring data that is manipulated by the processor 1404 when executingsoftware. The processing system 1414 further includes at least one ofthe components 1304, 1306, 1308, 1310, 1312. The components may besoftware components running in the processor 1404, resident/stored inthe computer readable medium/memory 1406, one or more hardwarecomponents coupled to the processor 1404, or some combination thereof.The processing system 1414 may be a component of the UE 350 and mayinclude the memory 360 and/or at least one of the TX processor 368, theRX processor 356, and the controller/processor 359.

In one configuration, the apparatus 1302/1302′ for wirelesscommunication includes means for receiving an indication of a pluralityof RBs, e.g., for a data transmission. The apparatus also includes meansfor receiving a SRS configuration corresponding to the indication of theplurality of RBs for the data transmission, wherein the SRSconfiguration comprises at least one SRS condition to be applied duringa temporary SRS window. The apparatus also includes means fortransmitting at least one SRS on a set of one or more RBs of theplurality of RBs according to the SRS configuration and the at least oneSRS condition during the temporary SRS window. Additionally, theapparatus includes means for receiving the DCI from a base station,wherein the temporary SRS window begins when the DCI is received. Theaforementioned means may be one or more of the aforementioned componentsof the apparatus 1302 and/or the processing system 1414 of the apparatus1302′ configured to perform the functions recited by the aforementionedmeans. As described supra, the processing system 1414 may include the TXProcessor 368, the RX Processor 356, and the controller/processor 359.As such, in one configuration, the aforementioned means may be the TXProcessor 368, the RX Processor 356, and the controller/processor 359configured to perform the functions recited by the aforementioned means.

It is understood that the specific order or hierarchy of blocks in theprocesses/flowcharts disclosed is an illustration of example approaches.Based upon design preferences, it is understood that the specific orderor hierarchy of blocks in the processes/flowcharts may be rearranged.Further, some blocks may be combined or omitted. The accompanying methodclaims present elements of the various blocks in a sample order, and arenot meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” The word “exemplary” is used hereinto mean “serving as an example, instance, or illustration.” Any aspectdescribed herein as “exemplary” is not necessarily to be construed aspreferred or advantageous over other aspects. Unless specifically statedotherwise, the term “some” refers to one or more. Combinations such as“at least one of A, B, or C,” “one or more of A, B, or C,” “at least oneof A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or anycombination thereof” include any combination of A, B, and/or C, and mayinclude multiples of A, multiples of B, or multiples of C. Specifically,combinations such as “at least one of A, B, or C,” “one or more of A, B,or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and“A, B, C, or any combination thereof” may be A only, B only, C only, Aand B, A and C, B and C, or A and B and C, where any such combinationsmay contain one or more member or members of A, B, or C. All structuraland functional equivalents to the elements of the various aspectsdescribed throughout this disclosure that are known or later come to beknown to those of ordinary skill in the art are expressly incorporatedherein by reference and are intended to be encompassed by the claims.Moreover, nothing disclosed herein is intended to be dedicated to thepublic regardless of whether such disclosure is explicitly recited inthe claims. The words “module,” “mechanism,” “element,” “device,” andthe like may not be a substitute for the word “means.” As such, no claimelement is to be construed as a means plus function unless the elementis expressly recited using the phrase “means for.”

What is claimed is:
 1. A method of wireless communication at a UserEquipment (UE), comprising: receiving a configuration to transmit one ormore sounding reference signals (SRSs) based on a downlink controlinformation (DCI); receiving an indication of a plurality ofnon-contiguous resource blocks (RBs) based on the DCI; transmitting afirst SRS on a first set of one or more RBs of the plurality ofnon-contiguous RBs; and transmitting a second SRS on a second set of oneor more RBs of the plurality of non-contiguous RBs; wherein the firstset of one or more RBs and the second set of one or more RBs areseparated by a distance of at least one RB.
 2. The method of claim 1,further comprising: determining one or more groups of contiguousphysical RBs (PRBs) including one or more RBs in the indication of theplurality of non-contiguous RBs; and determining a number of RBs for thefirst set of one or more RBs and the second set of one or more RBs basedon a corresponding number of RBs in the one or more groups of contiguousPRBs for a data transmission.
 3. The method of claim 2, wherein thenumber of RBs for the first set of one or more RBs and the second set ofone or more RBs is based on an integer number, wherein for a group ofcontiguous PRBs for the data transmission that is less than the integernumber, a corresponding SRS is transmitted using a corresponding set ofRBs that is increased to the integer number.
 4. The method of claim 3,wherein the integer number is received from a base station or ispre-configured in the UE.
 5. The method of claim 1, wherein the firstSRS is in a first symbol within a first slot and the second SRS is in asecond symbol within the first slot, wherein the first symbol, the firstslot, and the second symbol are determined based in part on one or moreof the configuration and one or more fields in the DCI.
 6. The method ofclaim 1, wherein the first SRS is in a first symbol within a first slotand the second SRS is in a second symbol within a second slot, whereinthe first symbol, the first slot, the second symbol and the second slotare determined based in part on one or more of the configuration and oneor more fields in the DCI.
 7. The method of claim 1, further comprising:receiving a hopping pattern indication of a hopping pattern associatedwith the first set of one or more RBs and the second set of one or moreRBs.
 8. The method of claim 7, wherein the first SRS and the second SRSare transmitted using the hopping pattern.
 9. The method of claim 7,wherein the first set of RBs is in a first symbol and a second set ofRBs is in a second symbol, wherein the first symbol and the secondsymbol are determined based in part on one or more of the configurationand one or more fields in the DCI.
 10. The method of claim 9, whereinthe first set of RBs and the second set of RBs are mapped using thehopping pattern.
 11. The method of claim 7, wherein the hopping patternis indicated based on the DCI.
 12. The method of claim 7, wherein thehopping pattern is indicated as one of a range of hopping patternsreceived using one or more the configuration, an radio resource control(RRC) signaling, or at least one field in the DCI.
 13. The method ofclaim 11, wherein the DCI indicates the hopping pattern, and wherein thehopping pattern indicates hopping within a group of contiguous PRBsallocated for a data transmission.
 14. The method of claim 1, whereinthe indication of the plurality of non-contiguous RBs is an allocationof the plurality of non-contiguous RBs for a data transmission.
 15. Anapparatus for wireless communication at a User Equipment (UE),comprising: a memory; and at least one processor coupled to the memoryand configured to: receive a configuration to transmit one or moresounding reference signals (SRSs) based on a downlink controlinformation (DCI); receive an indication of a plurality ofnon-contiguous resource blocks (RBs) based on the DCI; transmit a firstSRS on a first set of one or more RBs of the plurality of non-contiguousRBs; and transmit a second SRS on a second set of one or more RBs of theplurality of non-contiguous RBs; wherein the first set of one or moreRBs and the second set of one or more RBs are separated by a distance ofat least one RB.
 16. A method of wireless communication at a UserEquipment (UE), comprising: receiving an indication of a plurality ofresource blocks (RBs); receiving a sounding reference signal (SRS)configuration corresponding to the indication of the plurality of RBs,wherein the SRS configuration comprises at least one SRS condition to beapplied during a temporary SRS window; and transmitting at least one SRSon a set of one or more RBs of the plurality of RBs according to the SRSconfiguration and the at least one SRS condition during the temporarySRS window.
 17. The method of claim 16, wherein the UE applies the atleast one SRS condition during the temporary SRS window and transmitsthe at least one SRS according to the SRS configuration without the atleast one SRS condition after the temporary SRS window.
 18. The methodof claim 16, wherein at least a portion of the SRS configuration isincluded in a downlink control information (DCI).
 19. The method ofclaim 18, wherein the indication of the plurality of RBs is included inthe DCI.
 20. The method of claim 18, further comprising: receiving theDCI from a base station, wherein the temporary SRS window begins whenthe DCI is received.
 21. The method of claim 18, wherein the DCI doesnot indicate a new physical uplink shared channel (PUSCH) grant or aphysical downlink shared channel (PDSCH) grant.
 22. The method of claim21, wherein the DCI includes or updates a PUSCH grant or a PDSCH grantbased on boosting a transmit power of the at least one SRS.
 23. Themethod of claim 18, wherein the DCI triggers transmission of the atleast one SRS.
 24. The method of claim 18, wherein the DCI updates aprior SRS configuration.
 25. The method of claim 16, wherein the atleast one SRS condition includes at least one of: a periodicity, a setof one or more symbols, a resource element (RE) density, an RE offset,an SRS transmit power, or an SRS transmit power differential.
 26. Themethod of claim 16, wherein at least a portion of the temporary SRSwindow is configured using downlink control information (DCI) or a radioresource control (RRC) message.
 27. The method of claim 16, wherein theindication of the plurality of RBs is an allocation of the plurality ofRBs for a data transmission.
 28. An apparatus for wireless communicationat a User Equipment (UE), comprising: a memory; and at least oneprocessor coupled to the memory and configured to: receive an indicationof a plurality of resource blocks (RBs); receive a sounding referencesignal (SRS) configuration corresponding to the indication of theplurality of RBs, wherein the SRS configuration comprises at least oneSRS condition to be applied during a temporary SRS window; and transmitat least one SRS on a set of one or more RBs of the plurality of RBsaccording to the SRS configuration and the at least one SRS conditionduring the temporary SRS window.
 29. The apparatus of claim 28, whereinthe UE applies the at least one SRS condition during the temporary SRSwindow and transmits the at least one SRS according to the SRSconfiguration without the at least one SRS condition after the temporarySRS window.
 30. The apparatus of claim 28, wherein at least a portion ofthe SRS configuration is included in a downlink control information(DCI), wherein the indication of PRBs is included in the DCI.